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7s science revision

7G revision

what is an volume of an object? It is the amount of space that it takes up.
Explain what is dense If any object that its heavy for it's volume.
What are solids, liquids and gases? states of matter.
Explain what an theory is. If an idea has been tested and still works.
How can we show that the theory is right or wrong? by evidences.
What is the theory that can explain the different properties of solds, liquids and gases? It is called the particle theory.
What have the particles which are very close together? Solids
Why does liquids flow? The particles in a liquid are close to one another but can move past each other.
Why does gases spreads easily? The particles arre far apart and can move anywhere by themselves.
What are bonds? A force that held particles held tightly together in solid.
Why cant liquid be squashed? because the particles in liquid are already close together.
What can spark cause in the landfill site? can cause the gas to explode, burst or crack.
What are pressure caused by? particles.
Why can't we feel the air pressure? because we are so used to it.
What do you get when you suck all the air out of something? You get a vacuum.
Created by: tpark2